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Method for modifying eutectic silicon in aluminum alloy prepared by SLM

A technology of aluminum alloy and eutectic silicon, which is applied in the field of convenient and controllable fibrous or spherical eutectic silicon preparation, can solve the problems of element loss, high porosity, low density, etc. Simple to use effects

Active Publication Date: 2021-05-11
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above two methods have disadvantages. Element addition is often accompanied by element loss due to evaporation and chemical reaction. In addition, the introduction of chemical elements will also lead to high porosity and low density.
However, the process of applying an external force field is difficult to control, and the control parameters of the external force field are closely related to the geometric characteristics of the part.

Method used

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  • Method for modifying eutectic silicon in aluminum alloy prepared by SLM
  • Method for modifying eutectic silicon in aluminum alloy prepared by SLM
  • Method for modifying eutectic silicon in aluminum alloy prepared by SLM

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Experimental program
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Effect test

Embodiment 1

[0034] A modification method for preparing eutectic silicon in aluminum alloy by SLM, comprising the following steps:

[0035] (1) Establish 100×100×100mm with the help of computer 3D modeling auxiliary software 3 3D model, saved in stl format;

[0036] (2) Import the three-dimensional model in step (1) into the additive manufacturing model processing software, the raw material is AlSi10Mg (the specific heat capacity c is 0.88×10 3 J / (kg℃), density ρ is 2.64g / mm 3 , the thermal conductivity is 237W / g (m°C)), the parameter setting laser power is 350w, the scanning speed is 1000mm / s, the thickness d of the single powder layer is 30μm, and the scanning distance is 0.18mm. Execute slice layering and path filling commands, and export to a file format recognized by the device section;

[0037] (3) Perform equipment inspection and parameter setting, the substrate preheating temperature is 80°C, and the oxygen content is controlled below 800ppm. Import the file produced in step (2...

Embodiment 2

[0041] A modification method for preparing eutectic silicon in aluminum alloy by SLM, comprising the following steps:

[0042] (1) Establish 100×100×100mm with the help of computer 3D modeling auxiliary software 3 3D model, saved in stl format;

[0043] (2) Import the three-dimensional model in step (1) into the additive manufacturing model processing software, the raw material is AlSi10Mg, the parameter setting laser power is 350w, the scanning speed is 1000mm / s, the thickness d of the single layer of powder is 30μm, and the scanning distance is 0.18mm. Execute slice layering and path filling commands, and export to a file format recognized by the device section;

[0044] (3) Perform equipment inspection and parameter setting, the substrate preheating temperature is 80°C, and the oxygen content is controlled below 800ppm. Import the file produced in step (2) into the equipment for SLM manufacturing;

[0045] (4) During the preparation process, heat the substrate to 500°C,...

Embodiment 3

[0048] A modification method for preparing eutectic silicon in aluminum alloy by SLM, comprising the following steps:

[0049] (1) Establish 100×100×100mm with the help of computer 3D modeling auxiliary software 3 3D model, saved in stl format;

[0050] (2) Import the three-dimensional model in step (1) into the additive manufacturing model processing software, the raw material is AlSi10Mg, the parameter setting laser power is 350w, the scanning speed is 1000mm / s, the thickness d of the single layer of powder is 30μm, and the scanning distance is 0.18mm. Execute slice layering and path filling commands, and export to a file format recognized by the device section;

[0051] (3) Perform equipment inspection and parameter setting, the substrate preheating temperature is 80°C, and the oxygen content is controlled below 800ppm. Import the file produced in step (2) into the equipment for SLM manufacturing;

[0052] (4) During the preparation process, heat the substrate to 520°C,...

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Abstract

The invention discloses a method for modifying eutectic silicon in aluminum alloy prepared by SLM, and belongs to the field of metal material additive manufacturing. The method comprises the following steps that A, aluminum alloy powder is prepared into an aluminum alloy workpiece through SLM; and B, in the process of preparing the aluminum alloy workpiece through SLM, the aluminum alloy workpiece is subjected to thermal vibration treatment; and the specific operation of the thermal vibration treatment comprises the steps that after each printing period, a substrate and an inner cavity of SLM equipment is heated, heat preservation is conducted and then cooling is conducted to a preheating temperature of the substrate until the aluminum alloy workpiece is prepared. According to the method, the modification effect of the eutectic silicon is realized by adopting a thermal vibration treatment mode in the SLM process, the treated eutectic silicon structure presents a fine and smooth appearance, and no defects such as holes and cracks are found in the material. According to the method, no additional chemical elements and additional mechanical fields need to be added, operation is easy, the process is easy to control, and huge potential is provided for application of the aluminum alloy additive manufacturing technology in the aerospace field.

Description

technical field [0001] The invention relates to the technical field of metal additive manufacturing, in particular to a method for modifying eutectic silicon in aluminum alloys prepared by SLM, and in particular to a convenient and easy-to-control method for preparing fibrous or spherical eutectic silicon. Background technique [0002] Aluminum alloy is the most widely used material in the field of additive manufacturing. The additive manufacturing method provides a more powerful way for the manufacture of complex aluminum alloy components, and provides a strong guarantee for its application in the aerospace field. The morphology of eutectic silicon has a significant impact on the performance of aluminum alloys. Castings of eutectic silicon generally present a sheet or network structure with sharp edges and corners. This structure often scratches the substrate during the deformation process of the material. Instructor materials are invalid. Therefore, in aluminum alloy part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F10/50C22C21/04B33Y10/00B33Y40/00
CPCC22C21/04B33Y10/00B33Y40/00Y02P10/25
Inventor 孙靖王旭琴赵凯张春杰乔汝旺
Owner SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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